hard engine starting

sometimes my motor takes a few cranks to fire.
it shows no sign to want to fire , then maybe 3rd or 4th time she fires right up and after 30 seconds of 2000rpm it idles great.

410sbc
266/272 110 solid roller
locked timing 28
msd 6al / pro billet dissy
950 carb
12:1 comp

i am concerend about how this affects cylinder bores / washing down the oil.
also fouling plugs .. etc etc

near new motor
at cranking i have 10.6Volts

Sounds like you figured it out.